ui第五个文件解析

pull/10/head
baiyang 2 years ago committed by hejiaqi
parent 7075551351
commit e6524568bb

@ -0,0 +1,87 @@
package net.micode.notes.ui;
import java.util.Calendar;
import net.micode.notes.R;
import net.micode.notes.ui.DateTimePicker;
import net.micode.notes.ui.DateTimePicker.OnDateTimeChangedListener;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.text.format.DateFormat;
import android.text.format.DateUtils;
public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
private Calendar mDate = Calendar.getInstance();
//创建一个Calendar类型的变量 mDate方便时间的操作
private boolean mIs24HourView;
private OnDateTimeSetListener mOnDateTimeSetListener;
//声明一个时间日期滚动选择控件 mOnDateTimeSetListener
private DateTimePicker mDateTimePicker;
//DateTimePicker控件控件一般用于让用户可以从日期列表中选择单个值。
//运行时,单击控件边上的下拉箭头,会显示为两个部分:一个下拉列表,一个用于选择日期的
public interface OnDateTimeSetListener {
void OnDateTimeSet(AlertDialog dialog, long date);
}
public DateTimePickerDialog(Context context, long date) {
//对该界面对话框的实例化
super(context);
//对数据库的操作
mDateTimePicker = new DateTimePicker(context);
setView(mDateTimePicker);
//添加一个子视图
mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
public void onDateTimeChanged(DateTimePicker view, int year, int month,
int dayOfMonth, int hourOfDay, int minute) {
mDate.set(Calendar.YEAR, year);
mDate.set(Calendar.MONTH, month);
mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
mDate.set(Calendar.MINUTE, minute);
//将视图中的各选项设置为系统当前时间
updateTitle(mDate.getTimeInMillis());
}
});
mDate.setTimeInMillis(date);
//得到系统时间
mDate.set(Calendar.SECOND, 0);
//将秒数设置为0
mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
setButton(context.getString(R.string.datetime_dialog_ok), this);
setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
//设置按钮
set24HourView(DateFormat.is24HourFormat(this.getContext()));
//时间标准化打印
updateTitle(mDate.getTimeInMillis());
}
public void set24HourView(boolean is24HourView) {
mIs24HourView = is24HourView;
}
public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
mOnDateTimeSetListener = callBack;
}//将时间日期滚动选择控件实例化
private void updateTitle(long date) {
int flag =
DateUtils.FORMAT_SHOW_YEAR |
DateUtils.FORMAT_SHOW_DATE |
DateUtils.FORMAT_SHOW_TIME;
flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_24HOUR;
setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
}//android开发中常见日期管理工具类API——DateUtils按照上下午显示时间
public void onClick(DialogInterface arg0, int arg1) {
if (mOnDateTimeSetListener != null) {
mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
}
}//第一个参数arg0是接收到点击事件的对话框
//第二个参数arg1是该对话框上的按钮
}

@ -39,10 +39,14 @@ import java.io.PrintStream;
public class BackupUtils { public class BackupUtils {
private static final String TAG = "BackupUtils"; private static final String TAG = "BackupUtils";
// Singleton stuff // Singleton stuff
private static BackupUtils sInstance; private static BackupUtils sInstance; //类里面为什么可以定义自身类的对象?
public static synchronized BackupUtils getInstance(Context context) { public static synchronized BackupUtils getInstance(Context context) {
//ynchronized 关键字,代表这个方法加锁,相当于不管哪一个线程例如线程A
//运行到这个方法时,都要检查有没有其它线程B或者C、 D等正在用这个方法(或者该类的其他同步方法)有的话要等正在使用synchronized方法的线程B或者C 、D运行完这个方法后再运行此线程A,没有的话,锁定调用者,然后直接运行。
//它包括两种用法synchronized 方法和 synchronized 块。
if (sInstance == null) { if (sInstance == null) {
//如果当前备份不存在,则新声明一个
sInstance = new BackupUtils(context); sInstance = new BackupUtils(context);
} }
return sInstance; return sInstance;
@ -52,24 +56,24 @@ public class BackupUtils {
* Following states are signs to represents backup or restore * Following states are signs to represents backup or restore
* status * status
*/ */
// Currently, the sdcard is not mounted // Currently, the sdcard is not mounted SD卡没有被装入手机
public static final int STATE_SD_CARD_UNMOUONTED = 0; public static final int STATE_SD_CARD_UNMOUONTED = 0;
// The backup file not exist // The backup file not exist 备份文件夹不存在
public static final int STATE_BACKUP_FILE_NOT_EXIST = 1; public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
// The data is not well formated, may be changed by other programs // The data is not well formated, may be changed by other programs 数据已被破坏,可能被修改
public static final int STATE_DATA_DESTROIED = 2; public static final int STATE_DATA_DESTROIED = 2;
// Some run-time exception which causes restore or backup fails // Some run-time exception which causes restore or backup fails 超时异常
public static final int STATE_SYSTEM_ERROR = 3; public static final int STATE_SYSTEM_ERROR = 3;
// Backup or restore success // Backup or restore success 成功存储
public static final int STATE_SUCCESS = 4; public static final int STATE_SUCCESS = 4;
private TextExport mTextExport; private TextExport mTextExport;
private BackupUtils(Context context) { private BackupUtils(Context context) { //初始化函数
mTextExport = new TextExport(context); mTextExport = new TextExport(context);
} }
private static boolean externalStorageAvailable() { private static boolean externalStorageAvailable() { //外部存储功能是否可用
return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()); return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
} }
@ -128,11 +132,11 @@ public class BackupUtils {
public TextExport(Context context) { public TextExport(Context context) {
TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note); TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
mContext = context; mContext = context;
mFileName = ""; mFileName = ""; //为什么为空?
mFileDirectory = ""; mFileDirectory = "";
} }
private String getFormat(int id) { private String getFormat(int id) { //获取文本的组成部分
return TEXT_FORMAT[id]; return TEXT_FORMAT[id];
} }
@ -140,7 +144,7 @@ public class BackupUtils {
* Export the folder identified by folder id to text * Export the folder identified by folder id to text
*/ */
private void exportFolderToText(String folderId, PrintStream ps) { private void exportFolderToText(String folderId, PrintStream ps) {
// Query notes belong to this folder // Query notes belong to this folder 通过查询parent id是文件夹id的note来选出制定ID文件夹下的Note
Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI, Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] { NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
folderId folderId
@ -149,13 +153,13 @@ public class BackupUtils {
if (notesCursor != null) { if (notesCursor != null) {
if (notesCursor.moveToFirst()) { if (notesCursor.moveToFirst()) {
do { do {
// Print note's last modified date // Print note's last modified date ps里面保存有这份note的日期
ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format( ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm), mContext.getString(R.string.format_datetime_mdhm),
notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE)))); notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
// Query data belong to this note // Query data belong to this note
String noteId = notesCursor.getString(NOTE_COLUMN_ID); String noteId = notesCursor.getString(NOTE_COLUMN_ID);
exportNoteToText(noteId, ps); exportNoteToText(noteId, ps); //将文件导出到text
} while (notesCursor.moveToNext()); } while (notesCursor.moveToNext());
} }
notesCursor.close(); notesCursor.close();
@ -171,7 +175,7 @@ public class BackupUtils {
noteId noteId
}, null); }, null);
if (dataCursor != null) { if (dataCursor != null) { //利用光标来扫描内容区别为callnote和note两种靠ps.printline输出
if (dataCursor.moveToFirst()) { if (dataCursor.moveToFirst()) {
do { do {
String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE); String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
@ -181,7 +185,7 @@ public class BackupUtils {
long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE); long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
String location = dataCursor.getString(DATA_COLUMN_CONTENT); String location = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(phoneNumber)) { if (!TextUtils.isEmpty(phoneNumber)) { //判断是否为空字符
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
phoneNumber)); phoneNumber));
} }
@ -218,7 +222,7 @@ public class BackupUtils {
/** /**
* Note will be exported as text which is user readable * Note will be exported as text which is user readable
*/ */
public int exportToText() { public int exportToText() { //总函数调用上面的exportFolder和exportNote
if (!externalStorageAvailable()) { if (!externalStorageAvailable()) {
Log.d(TAG, "Media was not mounted"); Log.d(TAG, "Media was not mounted");
return STATE_SD_CARD_UNMOUONTED; return STATE_SD_CARD_UNMOUONTED;
@ -229,7 +233,7 @@ public class BackupUtils {
Log.e(TAG, "get print stream error"); Log.e(TAG, "get print stream error");
return STATE_SYSTEM_ERROR; return STATE_SYSTEM_ERROR;
} }
// First export folder and its notes // First export folder and its notes 导出文件夹,就是导出里面包含的便签
Cursor folderCursor = mContext.getContentResolver().query( Cursor folderCursor = mContext.getContentResolver().query(
Notes.CONTENT_NOTE_URI, Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION, NOTE_PROJECTION,
@ -257,7 +261,7 @@ public class BackupUtils {
folderCursor.close(); folderCursor.close();
} }
// Export notes in root's folder // Export notes in root's folder 将根目录里的便签导出(由于不属于任何文件夹,因此无法通过文件夹导出来实现这一部分便签的导出)
Cursor noteCursor = mContext.getContentResolver().query( Cursor noteCursor = mContext.getContentResolver().query(
Notes.CONTENT_NOTE_URI, Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION, NOTE_PROJECTION,
@ -297,7 +301,7 @@ public class BackupUtils {
PrintStream ps = null; PrintStream ps = null;
try { try {
FileOutputStream fos = new FileOutputStream(file); FileOutputStream fos = new FileOutputStream(file);
ps = new PrintStream(fos); ps = new PrintStream(fos); //将ps输出流输出到特定的文件目的就是导出到文件而不是直接输出
} catch (FileNotFoundException e) { } catch (FileNotFoundException e) {
e.printStackTrace(); e.printStackTrace();
return null; return null;
@ -314,16 +318,16 @@ public class BackupUtils {
*/ */
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) { private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
StringBuilder sb = new StringBuilder(); StringBuilder sb = new StringBuilder();
sb.append(Environment.getExternalStorageDirectory()); sb.append(Environment.getExternalStorageDirectory()); //外部SD卡的存储路径
sb.append(context.getString(filePathResId)); sb.append(context.getString(filePathResId)); //文件的存储路径
File filedir = new File(sb.toString()); File filedir = new File(sb.toString()); //filedir应该就是用来存储路径信息
sb.append(context.getString( sb.append(context.getString(
fileNameFormatResId, fileNameFormatResId,
DateFormat.format(context.getString(R.string.format_date_ymd), DateFormat.format(context.getString(R.string.format_date_ymd),
System.currentTimeMillis()))); System.currentTimeMillis())));
File file = new File(sb.toString()); File file = new File(sb.toString());
try { try { //如果这些文件不存在,则新建
if (!filedir.exists()) { if (!filedir.exists()) {
filedir.mkdir(); filedir.mkdir();
} }
@ -336,9 +340,8 @@ public class BackupUtils {
} catch (IOException e) { } catch (IOException e) {
e.printStackTrace(); e.printStackTrace();
} }
// try catch 异常处理
return null; return null;
} }
} }

@ -35,9 +35,11 @@ import java.util.ArrayList;
import java.util.HashSet; import java.util.HashSet;
package net.micode.notes.tool;
public class DataUtils { public class DataUtils {
public static final String TAG = "DataUtils"; public static final String TAG = "DataUtils";
public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) { public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) { //直接删除多个笔记
if (ids == null) { if (ids == null) {
Log.d(TAG, "the ids is null"); Log.d(TAG, "the ids is null");
return true; return true;
@ -47,18 +49,19 @@ public class DataUtils {
return true; return true;
} }
ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>(); ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>(); //提供一个任务列表
for (long id : ids) { for (long id : ids) {
if(id == Notes.ID_ROOT_FOLDER) { if(id == Notes.ID_ROOT_FOLDER) {
Log.e(TAG, "Don't delete system folder root"); Log.e(TAG, "Don't delete system folder root");
continue; continue;
} } //如果发现是根文件夹,则不删除
ContentProviderOperation.Builder builder = ContentProviderOperation ContentProviderOperation.Builder builder = ContentProviderOperation
.newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //用newDelete实现删除功能
operationList.add(builder.build()); operationList.add(builder.build()); //
} }
try { try {
ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//主机名或叫Authority用于唯一标识这个ContentProvider外部调用者可以根据这个标识来找到它。
//数据库事务,数据库事务是由一组数据库操作序列组成,事务作为一个整体被执行
if (results == null || results.length == 0 || results[0] == null) { if (results == null || results.length == 0 || results[0] == null) {
Log.d(TAG, "delete notes failed, ids:" + ids.toString()); Log.d(TAG, "delete notes failed, ids:" + ids.toString());
return false; return false;
@ -77,7 +80,7 @@ public class DataUtils {
values.put(NoteColumns.PARENT_ID, desFolderId); values.put(NoteColumns.PARENT_ID, desFolderId);
values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId); values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
values.put(NoteColumns.LOCAL_MODIFIED, 1); values.put(NoteColumns.LOCAL_MODIFIED, 1);
resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); //对需要移动的便签进行数据更新然后用update实现
} }
public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids, public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
@ -90,14 +93,14 @@ public class DataUtils {
ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>(); ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
for (long id : ids) { for (long id : ids) {
ContentProviderOperation.Builder builder = ContentProviderOperation ContentProviderOperation.Builder builder = ContentProviderOperation
.newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //通过withAppendedId方法为该Uri加上ID
builder.withValue(NoteColumns.PARENT_ID, folderId); builder.withValue(NoteColumns.PARENT_ID, folderId);
builder.withValue(NoteColumns.LOCAL_MODIFIED, 1); builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
operationList.add(builder.build()); operationList.add(builder.build());
} }//将ids里包含的每一列的数据逐次加入到operationList中等待最后的批量处理
try { try {
ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); //applyBatch一次性处理一个操作列表
if (results == null || results.length == 0 || results[0] == null) { if (results == null || results.length == 0 || results[0] == null) {
Log.d(TAG, "delete notes failed, ids:" + ids.toString()); Log.d(TAG, "delete notes failed, ids:" + ids.toString());
return false; return false;
@ -119,7 +122,7 @@ public class DataUtils {
new String[] { "COUNT(*)" }, new String[] { "COUNT(*)" },
NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?", NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)}, new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
null); null); //筛选条件源文件不为trash folder
int count = 0; int count = 0;
if(cursor != null) { if(cursor != null) {
@ -137,15 +140,15 @@ public class DataUtils {
} }
public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) { public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), //通过withAppendedId方法为该Uri加上ID
null, null,
NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER, NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
new String [] {String.valueOf(type)}, new String [] {String.valueOf(type)},
null); null); //查询条件type符合且不属于垃圾文件夹
boolean exist = false; boolean exist = false;
if (cursor != null) { if (cursor != null) {
if (cursor.getCount() > 0) { if (cursor.getCount() > 0) {//用getcount函数判断cursor是否为空
exist = true; exist = true;
} }
cursor.close(); cursor.close();
@ -187,6 +190,7 @@ public class DataUtils {
" AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
" AND " + NoteColumns.SNIPPET + "=?", " AND " + NoteColumns.SNIPPET + "=?",
new String[] { name }, null); new String[] { name }, null);
//通过名字查询文件是否存在
boolean exist = false; boolean exist = false;
if(cursor != null) { if(cursor != null) {
if(cursor.getCount() > 0) { if(cursor.getCount() > 0) {
@ -202,7 +206,7 @@ public class DataUtils {
new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE }, new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
NoteColumns.PARENT_ID + "=?", NoteColumns.PARENT_ID + "=?",
new String[] { String.valueOf(folderId) }, new String[] { String.valueOf(folderId) },
null); null); //查询条件父ID是传入的folderId;
HashSet<AppWidgetAttribute> set = null; HashSet<AppWidgetAttribute> set = null;
if (c != null) { if (c != null) {
@ -211,13 +215,13 @@ public class DataUtils {
do { do {
try { try {
AppWidgetAttribute widget = new AppWidgetAttribute(); AppWidgetAttribute widget = new AppWidgetAttribute();
widget.widgetId = c.getInt(0); widget.widgetId = c.getInt(0); //0对应的NoteColumns.WIDGET_ID
widget.widgetType = c.getInt(1); widget.widgetType = c.getInt(1); //1对应的NoteColumns.WIDGET_TYPE
set.add(widget); set.add(widget);
} catch (IndexOutOfBoundsException e) { } catch (IndexOutOfBoundsException e) {
Log.e(TAG, e.toString()); Log.e(TAG, e.toString());
} }
} while (c.moveToNext()); } while (c.moveToNext()); //查询下一条
} }
c.close(); c.close();
} }
@ -250,11 +254,12 @@ public class DataUtils {
+ CallNote.PHONE_NUMBER + ",?)", + CallNote.PHONE_NUMBER + ",?)",
new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber }, new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
null); null);
//通过数据库操作查询条件是callDate和phoneNumber匹配传入参数的值
if (cursor != null) { if (cursor != null) {
if (cursor.moveToFirst()) { if (cursor.moveToFirst()) {
try { try {
return cursor.getLong(0); return cursor.getLong(0); //0对应的CallNote.NOTE_ID
} catch (IndexOutOfBoundsException e) { } catch (IndexOutOfBoundsException e) {
Log.e(TAG, "Get call note id fails " + e.toString()); Log.e(TAG, "Get call note id fails " + e.toString());
} }
@ -269,7 +274,7 @@ public class DataUtils {
new String [] { NoteColumns.SNIPPET }, new String [] { NoteColumns.SNIPPET },
NoteColumns.ID + "=?", NoteColumns.ID + "=?",
new String [] { String.valueOf(noteId)}, new String [] { String.valueOf(noteId)},
null); null);//查询条件noteId
if (cursor != null) { if (cursor != null) {
String snippet = ""; String snippet = "";
@ -281,8 +286,7 @@ public class DataUtils {
} }
throw new IllegalArgumentException("Note is not found with id: " + noteId); throw new IllegalArgumentException("Note is not found with id: " + noteId);
} }
public static String getFormattedSnippet(String snippet) { //对字符串进行格式处理,将字符串两头的空格去掉,同时将换行符去掉
public static String getFormattedSnippet(String snippet) {
if (snippet != null) { if (snippet != null) {
snippet = snippet.trim(); snippet = snippet.trim();
int index = snippet.indexOf('\n'); int index = snippet.indexOf('\n');
@ -292,4 +296,5 @@ public class DataUtils {
} }
return snippet; return snippet;
} }
} }
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